Dielectric Filter and Communication Device

This application is a continuation of International Patent Application No. PCT/CN 2024/095684, filed on May 28, 2024, which claims priority to Chinese Patent Application No. 202310876692.5, filed on Jul. 17, 2023. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.

This application relates to the field of communication technologies, and in particular, to a dielectric filter and a communication device.

With development of communication technologies, the requirement for reducing power consumption of communication systems is increasingly strong. Dielectric filters are increasingly widely used due to advantages such as small volumes, small insertion losses, large withstand powers, and low costs. The dielectric filter is typically formed by coupling several dielectric resonators. Because coupling among a plurality of dielectric resonators can enlarge a magnetic field distribution area of the entire dielectric filter, the coupling can cause reduction in a suppression capability for a high-order harmonic wave band. That is, a remote suppression capability of the dielectric filter is poor, failing to meet user requirements. In conventional technologies, an additional low-pass filter is typically added to cooperate with a dielectric filter to suppress high-order harmonic waves. However, the additional low-pass filter accordingly increases insertion losses and increases power consumption of a communication system. This is not conducive to the design requirement of reducing the system power consumption.

This application provides a dielectric filter and a communication device to resolve a problem in conventional technologies that a dielectric filter has a poor remote suppression capability and an additional low-pass filter is needed for remote suppression.

A first aspect of embodiments of this application provides a dielectric filter. The dielectric filter includes at least two dielectric resonators connected to each other and includes a hole group. Each of the dielectric resonators includes a dielectric body and a resonant cavity. The dielectric body includes a top surface and a bottom surface along a first direction Z of the dielectric filter. The resonant cavity runs through the top surface or the bottom surface. The dielectric body further includes a first side surface and a second side surface along a second direction Y of the dielectric filter. The hole group is disposed between two adjacent dielectric resonators. Each hole group includes a first hole and a second hole. Two ends of the first hole respectively run through the top surface and the bottom surface. The second hole runs through at least one of the first side surface and the second side surface. Projections of the first hole and the second hole intersect along a third direction X of the dielectric filter.

In this application, the hole group is disposed between two adjacent dielectric resonators, and a magnetic field between the two adjacent dielectric resonators may be cut by using the hole group, so that a magnetic field distribution area of the dielectric filter is reduced, thereby improving a suppression capability to a high-order harmonic wave, reducing coupling strength between high-order modes, and improving a remote suppression capability of the dielectric filter. In addition, because the projections of the first hole and the second hole intersect in the third direction X, the hole group may generate components along various directions in a plane perpendicular to the third direction X, and can a cut magnetic field between two adjacent dielectric resonators in various directions, so that the magnetic field between the two adjacent dielectric resonators can be cut more fully, thereby further reducing the magnetic field distribution area of the dielectric filter, further reducing the coupling strength between the high-order modes of the high-order harmonic wave, and further improving the remote suppression capability of the dielectric filter. In addition, compared with an existing conventional dielectric filter requiring an additional low-pass filter to cooperate in suppressing a high-order harmonic wave, the dielectric filter in this embodiment of this application has a strong remote suppression capability, and no additional low-pass filter needs to be added to cooperate with the dielectric filter to suppress the high-order harmonic wave, thereby reducing manufacturing costs, and reducing insertion losses caused by the addition of the low-pass filter, reducing power consumption of a communication device, and meeting a use requirement of a user, that is, facilitating a design requirement of reducing insertion losses by removing a low-pass filter from a communication device system, and improving user experience.

In an embodiment, an included angle between the projections of the first hole and the second hole in the third direction X is an intersection angle, and at least two intersection angles differ in magnitude.

In this solution, by changing an intersection angle between the first hole and the second hole of the hole group, a resonance frequency of the hole group can be adjusted. Therefore, the impact of the resonance frequency of the hole group on a remote suppression degree of the dielectric filter can be reduced while it is ensured that the hole group fully cuts the magnetic field between the two adjacent dielectric resonators, thereby improving the remote suppression capability of the dielectric filter. Particularly, in a structure in which there are a plurality of hole groups in the dielectric filter, intersection angles in the plurality of hole groups are different so that resonance frequencies of the plurality of hole groups are different, thereby reducing mutual excitation between the resonance frequencies of the plurality of hole groups to reduce impact on the dielectric filter and effectively improve the remote suppression capability of the dielectric filter.

In an embodiment, in the at least one hole group, the first hole is in communication with the second hole to reduce space occupied by the hole group in the third direction X, thereby facilitating a miniaturization of the dielectric filter.

In an embodiment, in at least one hole group, the first hole and the second hole are staggered so that a process requirement can be further reduced, formation of the hole group is more convenient, and flexibility is higher. In addition, when there is another structure or component between two adjacent dielectric resonators, the hole group of the structure may enable more proper formation of the first hole and the second hole in space between the two adjacent dielectric resonators, thereby facilitating the miniaturization design of the dielectric filter.

In an embodiment, in the at least one hole group there are a plurality of first holes, and at least one of the first holes is in communication with the second hole to further improve design flexibility of the structure of the hole group, improve spatial rationality of the hole group between the two adjacent dielectric resonators, further improve design flexibility and an adjustment range of a frequency of the hole group, and reduce impact of the frequency of the hole group on a remote suppression degree of the dielectric filter.

In an embodiment, in at least one hole group there are a plurality of second holes, and at least one of the second holes is in communication with the first hole to further improve design flexibility of the structure of the hole group, improve spatial rationality of the hole group between the two adjacent dielectric resonators, further improve design flexibility and an adjustment range of a frequency of the hole group, and reduce impact of the frequency of the hole group on a remote suppression degree of the dielectric filter.

In an embodiment, one of at least two adjacent dielectric resonators includes a first co-fired surface, another includes a second co-fired surface, and the first co-fired surface is opposite to the second co-fired surface; the first co-fired surface is provided with a first groove; the second co-fired surface is provided with a second groove, the second groove corresponds to the first groove; the first co-fired surface is connected to the second co-fired surface, and the first groove and the second groove are enclosed to define the first hole and/or the second hole.

In this solution, the first groove and the second groove corresponding to the first hole and/or the second hole of the hole group may be prepared in advance on the first co-fired surface and the second co-fired surface so that when the two adjacent dielectric resonators are connected by using the first co-fired surface and the second co-fired surface, the first groove and the second groove are engaged and surrounded to form the first hole and/or the second hole, thereby facilitating formation of the first hole and/or the second hole with a relatively complex structure, and improving the design flexibility of the dielectric filter.

In an embodiment, at least two adjacent dielectric resonators are integrally formed so that the dielectric filter is prepared in a large quantity and preparation costs are reduced.

In an embodiment, the first hole is a straight through hole or a curved through hole to improve design flexibility of the first hole.

In an embodiment, a cross section of the first hole is one of rectangular, circular, elliptical, triangular, or T-shaped, to facilitate processing and formation of the first hole.

In an embodiment, the second hole is a straight hole or a curved hole to improve design flexibility of the second hole.

In an embodiment, a cross section of the second hole is one of rectangular, circular, elliptical, triangular, or T-shaped, to facilitate processing and formation of the second hole.

In an embodiment, a surface of at least one of the resonant cavity, the first hole, and the second hole is coated with a metallized layer so that leakage of harmonic energy can be reduced, reliable transmission of a signal can be ensured, and signal transmission efficiency can be improved.

A second aspect of embodiments of this application further provides a communication device including the dielectric filter according to any one of the foregoing embodiments. Because the dielectric filter has the foregoing technical effect, the communication device including the dielectric filter should also have the corresponding technical effect. Details are not described herein again.

It should be understood that the foregoing general descriptions and the following detailed descriptions are merely used as an example, and should not limit this application.

10 —dielectric filter; 1 11 —dielectric body; 12 —resonant cavity; 13 —top surface; 14 —bottom surface; 15 —first side surface; 16 —second side surface; —dielectric resonator; 2 21 —first hole; 22 —second hole; —hole group; 3 —first dielectric resonator; 4 41 —first co-fired surface; 42 —first groove; —second dielectric resonator; 5 51 —second co-fired surface; 52 —second groove; —third dielectric resonator; 6 —fourth dielectric resonator; X—third direction; Y—second direction; and Z—first direction.

The accompanying drawings herein are incorporated into this specification and constitute a part of this specification to show embodiments in accordance with this application and are used together with this specification to explain the principle of this application.

To better understand technical solutions of this application, the following describes embodiments of this application in detail with reference to the accompanying drawings.

In descriptions of this application, unless otherwise specified and limited, the terms “first” and “second” are merely intended for a purpose of description, and cannot be understood as an indication or implication of relative importance. Unless otherwise specified or stated, the term “a plurality of” means two or more than two. The terms “connection”, “fastening”, and the like all should be understood in a broad sense. For example, “connection” may be a fastened connection; or may be a detachable connection, an integrated connection, or an electrical connection; or may be a direct connection; or may be an indirect connection through an intermediate medium. A person of ordinary skill in the art may understand the meanings of the foregoing terms in this application based on a particular case.

The following further describes this application in detail with reference to particular embodiments and the accompanying drawings.

With development of communication technologies, the requirement for reducing power consumption of communication systems is increasingly strong. Dielectric filters are increasingly widely used due to advantages such as small volumes, small insertion losses, large withstand powers, and low costs. The dielectric filter is typically formed by coupling several dielectric resonators. Because coupling among a plurality of dielectric resonators can enlarge a magnetic field distribution area of the entire dielectric filter, causing reduction in a suppression capability for a high-order harmonic wave section. That is, a remote suppression capability of the dielectric filter is poor, failing to meet user requirements.

In conventional technologies, an additional low-pass filter is generally added to cooperate with a dielectric filter to suppress a high-order harmonic wave. However, the additional low-pass filter correspondingly increases insertion losses. Consequently, power consumption of a communication system increases. This is not conducive to a design requirement of reducing the power consumption of the system.

To resolve the foregoing technical problem, an embodiment of this application provides a dielectric filter to improve a remote suppression capability of the dielectric filter so that no additional low-pass filter needs to be added to cooperate with the dielectric filter to suppress a high-order harmonic wave. The dielectric filter may be used in a communication device. Because the remote suppression capability of the dielectric filter is strong, no additional low-pass filter needs to be added to suppress the high-order harmonic wave, thereby reducing insertion losses of a communication device system, reducing power consumption of the communication device, and meeting a use requirement of a user. The communication device may be but is not limited to a duplexer, a multiplexer, a base station, a terminal device, or the like. A form of the communication device is not specially limited in this embodiment of this application.

To describe the technical solutions in embodiments of this application more clearly, the following describes in detail, with reference to the accompanying drawings, the dielectric filter and the communication device that are provided in embodiments of this application.

1 FIG. 1 FIG. 10 10 1 1 1 11 12 11 13 14 10 12 13 14 12 12 is a diagram of a structure of a dielectric filteraccording to an embodiment. As shown in, the dielectric filterincludes at least two dielectric resonatorsconnected to each other. A quantity of dielectric resonatorsmay be designed based on an actual requirement and is not limited herein. Each of the dielectric resonatorsincludes a dielectric bodyand a resonant cavity. The dielectric bodyincludes a top surfaceand a bottom surfacealong a first direction Z of the dielectric filter. The resonant cavityruns through the top surfaceor the bottom surface. After a radio signal enters the resonant cavity, a signal with a specific frequency passes through the resonant cavitythrough selection, thereby implementing a filtering function.

1 FIG. 10 2 11 15 16 10 2 1 1 2 10 10 As shown in, the dielectric filterin this embodiment further includes a hole group. The dielectric bodyfurther includes a first side surfaceand a second side surfacealong a second direction Y of the dielectric filter. The hole groupis formed between two adjacent dielectric resonators. A magnetic field between the two adjacent dielectric resonatorsmay be cut by using the hole groupso that a magnetic field distribution area of the dielectric filteris reduced, thereby improving a suppression capability of a high-order harmonic wave, reducing coupling strength between high-order modes, and improving a remote suppression capability of the dielectric filter.

1 FIG. 2 FIG. 2 FIG. 10 2 21 22 21 13 14 22 15 16 21 22 10 Further, as shown inand,is a diagram of a structure of a dielectric filteraccording to an embodiment. Each hole groupincludes a first holeand a second hole. Two ends of the first holerespectively run through the top surfaceand the bottom surface. The second holeruns through at least one of the first side surfaceand the second side surface. Projections of the first holeand the second holeintersect along a third direction X of the dielectric filter.

2 10 22 15 16 22 2 10 22 15 16 22 16 15 22 22 1 FIG. 2 FIG. In the hole groupof the dielectric filtershown in, two ends of the second holerespectively run through the first side faceand the second side face, in other words, the second holemay be a through hole. In the hole groupof the dielectric filtershown in, one end of the second holeruns through the first side face, and the other end does not run through the second side face. Certainly, one end of the second holemay alternatively run through the second side face, and the other end does not run through the first side face, in other words, the second holemay alternatively be a blind hole. A structure of the second holemay be set based on an actual requirement and is not limited herein.

1 FIG. 21 22 2 1 1 10 10 10 10 In this embodiment, as shown in, because the projections of the first holeand the second holeintersect in the third direction X, the hole groupmay generate components along various directions in a plane perpendicular to the third direction X, and can cut a magnetic field between two adjacent dielectric resonatorsin various directions so that the magnetic field between the two adjacent dielectric resonatorscan be cut more fully, thereby further reducing the magnetic field distribution area of the dielectric filter, further reducing the coupling strength between the high-order modes of the high-order harmonic wave, and further improving the remote suppression capability of the dielectric filter. In addition, compared with an existing conventional dielectric filter requiring an additional low-pass filter to cooperate in suppressing a high-order harmonic wave, the dielectric filterin this embodiment of this application has a strong remote suppression capability, and no additional low-pass filter needs to be added to cooperate with the dielectric filterto suppress the high-order harmonic wave, thereby reducing manufacturing costs, reducing insertion losses caused by the addition of the low-pass filter, reducing power consumption of a communication device, and meeting a use requirement of a user, that is, facilitating a design requirement of reducing insertion losses by removing a low-pass filter from a communication device system and improving user experience.

10 2 1 10 1 2 1 2 1 2 1 2 2 10 2 2 1 FIG. It should be noted that in the dielectric filtershown in, only a case in which one hole groupis formed between two adjacent dielectric resonatorsis shown. Optionally, when the dielectric filterhas three or more dielectric resonators, a hole groupis formed between any two adjacent dielectric resonators, or a hole groupmay be formed between some of two adjacent dielectric resonators. Further, a quantity of hole groupsbetween two adjacent dielectric resonatorsmay be one, two, three, or the like. Because a position of the hole groupand the quantity of hole groupscauses different cutting effects on the magnetic field of the dielectric filter, the position of the hole groupand the quantity of hole groupsboth may be designed based on actual requirements and are not limited herein.

10 10 11 15 16 13 14 21 2 13 21 14 22 15 16 21 22 1 FIG. 1 FIG. In addition, the dielectric filtershown inis merely shown in a simple and intuitive cuboid structure. However, it should be understood thatis merely an implementation. An existence form of the dielectric filterprovided in this embodiment of this application is not limited to a cuboid, and may be a polyhedron. In this case, the dielectric bodymay have a plurality of first side facesand second side facesalong the second direction Y, or may have a plurality of top surfacesand bottom surfacesalong the first direction Z. In this case, one end of the first holein the hole groupmay run through any one of the plurality of top surfaces, the other end of the first holemay run through any one of the plurality of bottom surfaces, and the second holeruns through at least one of the plurality of first side surfacesand the plurality of second side surfaces, provided that it can be ensured that the projections of the first holeand the second holeintersect in the third direction X. This is not limited herein.

3 FIG. 5 FIG. Further,toare diagrams of structures of dielectric filters in other embodiments according to embodiments of this application.

1 FIG. 5 FIG. 21 21 21 21 21 21 As shown into, the first holemay be a straight through hole to facilitate processing and formation of the first hole. The first holemay be a vertical hole, or may be a tilted hole. Certainly, the first holemay alternatively be a curved through hole, for example, may be a multi-segment bent through hole, a wavy through hole, or another through hole having an irregular channel to improve design flexibility of the first hole. A shape of the first holemay be designed based on an actual requirement and is not limited herein.

21 21 21 21 1 FIG. 2 FIG. 3 FIG. 4 FIG. 5 FIG. Further, a cross section of the first holemay be of various shapes, for example, a simple shape such as a circle shown in, a square shown inand, a rectangle shown in, or an ellipse shown in, to facilitate processing and formation of the first hole. Certainly, a cross section shape of the first holemay alternatively be a triangle, a T shape, or another irregular shape. A cross section shape of the first holemay be designed based on an actual requirement and is not limited herein.

1 FIG. 5 FIG. 22 22 22 22 22 22 As shown into, the second holemay be a straight hole to facilitate processing and formation of the second hole. The second holemay be a vertical hole, or may be a tilted hole. Certainly, the second holemay alternatively be a curved hole, for example, may be a multi-segment bent hole, a wavy hole, or another hole having an irregular channel to improve design flexibility of the second hole. A shape of the second holemay be designed based on an actual requirement and is not limited herein.

22 22 22 22 1 FIG. 2 FIG. 3 FIG. 4 FIG. 5 FIG. Further, a cross section of the second holemay also be of various shapes (for example, a simple shape such as a circle or cylinder shown in, a square as shown inand, a rectangle as shown in, or an ellipse as shown in) to facilitate processing and formation of the second hole. A cross section shape of the second holemay alternatively be triangular, a T shape, or another irregular shape. A cross section shape of the second holemay be designed based on an actual requirement and is not limited herein.

21 22 It should be noted that the first holeand the second holemay have a same shape and structure, or may have different shapes and structures. This may be designed based on an actual requirement and is not limited herein.

6 FIG. 7 FIG. 21 22 21 22 andare diagrams of structures of dielectric filters according to embodiments. An included angle between projections of a first holeand a second holein a third direction X is an intersection angle α. At least two intersection angles α differ in magnitude. For example, the intersection angle α between the projections of the first holeand the second holein the third direction X is 30°, 60°, 90°, 120°, 150°, or the like. A value of the intersection angle α may be designed based on an actual requirement and is not limited herein.

6 FIG. 7 FIG. 2 10 2 10 2 2 10 10 21 22 2 2 2 10 2 1 10 2 10 2 2 2 10 10 In this embodiment, as shown inand, each hole groupalso has a resonance frequency and the resonance frequency also affects the remote suppression capability of the dielectric filter. Therefore, if there are a plurality of hole groupsin the dielectric filterand frequencies of the plurality of hole groupsare the same or similar, resonance frequencies of the plurality of hole groupsare mutually excited, increasing impact on the remote suppression capability of the dielectric filter. Consequently, the remote suppression capability of the dielectric filterdecreases. By changing an intersection angle α between the first holeand the second holeof the hole group, a resonance frequency of the hole groupcan be adjusted. Therefore, impact of the resonance frequency of the hole groupon a remote suppression degree of the dielectric filtercan be reduced while it is ensured that the hole groupfully cuts the magnetic field between the two adjacent dielectric resonators, thereby improving the remote suppression capability of the dielectric filter. Particularly, in a structure in which there are a plurality of hole groupsin the dielectric filter, intersection angles α in the plurality of hole groupsare different so that resonance frequencies of the plurality of hole groupsare different, thereby reducing mutual excitation between the resonance frequencies of the plurality of hole groupsto reduce impact on the dielectric filterand effectively improve the remote suppression capability of the dielectric filter.

2 10 2 It should be noted that when there are a plurality of hole groupsin the dielectric filter, intersections angles α of the plurality of hole groupsmay be the same or different or partially the same in magnitude. This may be designed based on an actual requirement and is not limited herein.

1 FIG. 7 FIG. 2 21 22 2 10 In the embodiment shown into, in one hole group, a first holemay be communicated with a second holeto reduce space occupied by the hole groupin the third direction X, thereby facilitating a miniaturization design of the dielectric filter.

8 FIG. 8 FIG. 21 22 21 22 is a diagram of a structure of a dielectric filter according to an embodiment. As shown in, the first holeand the second holemay alternatively be staggered, that is, the first holemay not be communicated with the second hole.

8 FIG. 2 2 1 2 21 22 1 10 In the embodiment shown in, the hole groupof the structure can further reduce a process requirement, formation of the hole groupis more convenient, and flexibility is higher. In addition, when there is another structure or component between the two adjacent dielectric resonators, the hole groupof the structure may enable more proper formation of the first holeand the second holein space between the two adjacent dielectric resonators, thereby facilitating the miniaturization design of the dielectric filter.

9 FIG. 9 FIG. 2 21 21 22 is a diagram of a structure of a dielectric filter according to an embodiment. In the embodiment shown in, in at least one hole groupthere are a plurality of first holes, and at least one first holeis in communication with a second hole.

9 FIG. 21 21 22 21 22 21 22 21 22 21 22 2 2 1 2 2 10 In the embodiment shown in, when there are a plurality of first holes, at least one of the plurality of first holesis in communication with the second hole, or all first holesmay be communicated with the second hole. In other words, the plurality of first holesmay be all communicated with one second hole; or some first holesmay be communicated with one second holeand other first holesare not communicated with the second hole, to further improve design flexibility of the structure of the hole group, improve spatial rationality of the hole groupbetween the two adjacent dielectric resonators, further improve design flexibility and an adjustment range of a frequency of the hole group, and reduce impact of the frequency of the hole groupon a remote suppression degree of the dielectric filter.

21 22 Further, intersection angles α between projections of the plurality of first holesand the second holein a third direction X may be the same, or may be partially the same, or may be different. This may be set based on an actual requirement and is not limited herein.

10 FIG. 10 FIG. 2 22 22 21 is a diagram of a structure of a dielectric filter according to an embodiment. In the embodiment shown in, in at least one hole groupthere are a plurality of second holes, and at least one second holeis in communication with a first hole.

10 FIG. 22 22 21 22 21 22 21 22 21 21 22 2 2 1 2 2 10 In the embodiment shown in, when there are a plurality of second holes, at least one of the plurality of second holesis in communication with the first hole, or all second holesmay be communicated with the first hole. In other words, the plurality of second holesmay be all communicated with one first hole; or some second holesmay be communicated with one first holeand other second holesare not communicated with the first hole, to further improve design flexibility of the structure of the hole group, improve spatial rationality of the hole groupbetween the two adjacent dielectric resonators, further improve design flexibility and an adjustment range of a frequency of the hole group, and reduce impact of the frequency of the hole groupon a remote suppression degree of the dielectric filter.

22 21 Further, intersection angles α between projections of the plurality of second holesand the first holein a third direction X may be the same, or may be partially the same, or may be different. This may be set based on an actual requirement and is not limited herein.

2 21 22 21 22 In another embodiment, one hole groupmay alternatively have a plurality of first holesand a plurality of second holes. The plurality of first holesand the plurality of second holesmay all be communicated, or may be not communicated, or may be partially communicated. This may be set based on an actual requirement and is not limited herein.

2 10 2 It should be noted that when there are a plurality of hole groupsin the dielectric filter, the plurality of hole groupsmay be completely the same, or may be partially the same, or may be different. This may be set based on an actual requirement and is not limited herein.

10 10 Based on different structures of the dielectric filter, a manner of preparing the dielectric filtermay also be different.

1 FIG. 10 FIG. 10 1 10 In an embodiment as shown into, the dielectric filtermay be of an integrally formed structure and at least two adjacent dielectric resonatorsare integrally formed so that the dielectric filteris prepared in a large quantity and preparation costs are reduced.

1 10 10 1 41 51 41 51 41 42 51 52 52 42 41 51 42 52 21 22 In another embodiment, two adjacent dielectric resonatorsof the dielectric filtermay be formed separately first, and then the dielectric filteris formed in a manner such as co-firing, that is, one of at least two adjacent dielectric resonatorsincludes a first co-fired surface, another includes a second co-fired surface. The first co-fired surfaceis opposite to the second co-fired surface. The first co-fired surfaceis provided with a first groove. The second co-fired surfaceis provided with a second groove. The second groovecorresponds to the first groove. The first co-fired surfaceis connected to the second co-fired surface. The first grooveand the second grooveare enclosed to define the first holeand/or the second hole.

11 FIG. 42 52 21 22 2 41 51 1 41 51 42 52 21 22 21 22 10 In the embodiment as shown in, the first grooveand the second groovecorresponding to the first holeand/or the second holeof the hole groupmay be prepared in advance on the first co-fired surfaceand the second co-fired surface. Therefore, when the two adjacent dielectric resonatorsare connected by using the first co-fired surfaceand the second co-fired surface, the first grooveand the second grooveare engaged and surrounded to form the first holeand/or the second hole, thereby facilitating formation of the first holeand/or the second holewith a relatively complex structure and improving the design flexibility of the dielectric filter.

10 1 1 1 Certainly, when one dielectric filterincludes a plurality of dielectric resonators, some of two adjacent dielectric resonatorsmay be integrally formed, and other dielectric resonatorsare co-fired, to further reduce costs and improve design flexibility.

11 FIG. 11 FIG. 11 FIG. 10 3 4 5 6 2 3 4 2 4 5 2 5 6 In the embodiment shown in,is a diagram of a structure of a dielectric filter according to an embodiment. As shown in, the dielectric filterincludes a first dielectric resonator, a second dielectric resonator, a third dielectric resonator, and a fourth dielectric resonatorthat are sequentially disposed. There is no hole groupbetween the first dielectric resonatorand the second dielectric resonator. There is a hole groupbetween the second dielectric resonatorand the third dielectric resonator. There is no hole groupbetween the third dielectric resonatorand the fourth dielectric resonator.

11 FIG. 3 4 5 6 41 51 4 5 42 52 41 51 4 5 41 51 42 52 2 2 In the embodiment shown in, the first dielectric resonatorand the second dielectric resonatorare integrally formed and the third dielectric resonatorand the fourth dielectric resonatorare integrally formed. The first co-fired surfaceand the second co-fired surfaceare respectively formed on two opposite surfaces of the second dielectric resonatorand the third dielectric resonatorand the first grooveand the second grooveare respectively formed on surfaces of the first co-fired surfaceand the second co-fired surface. Finally, the second dielectric resonatorand the third dielectric resonatorare co-fired and connected by using the first co-fired surfaceand the second co-fired surface. The first grooveand the second grooveare enclosed to define the hole group. In this way, costs can be reduced to a maximum extent, a relatively complex hole groupcan be formed, and production efficiency is improved.

12 21 22 In an embodiment, a surface of at least one of the resonant cavity, the first hole, and/or the second holeis coated with a metallized layer so that leakage of harmonic energy can be reduced, reliable transmission of a signal can be ensured, and signal transmission efficiency can be improved.

12 21 22 12 21 22 1 10 The metallized layer may completely cover the surface of the at least one of the resonant cavity, the first hole, and/or the second hole. Certainly, the metallized layer may also partially cover a surface of at least one of the resonant cavity, the first hole, and the second holeto adjust a resonance frequency of the dielectric resonator, thereby improving a remote suppression capability of the dielectric filter. A structure of the metallized layer may be set based on an actual requirement and is not limited herein.

A material of the metallized layer may be a metal material such as silver or copper, and is not limited herein.

10 10 10 An embodiment of this application further provides a communication device including the dielectric filteraccording to any one of the foregoing embodiments. Because the dielectric filterhas the foregoing technical effect, the communication device including the dielectric filtershould also have the corresponding technical effect. Details are not described herein again.

Further, the communication device may be, but is not limited to, a duplexer, a multiplexer, a base station, a terminal device, or the like. A form of the communication device is not limited in this embodiment of this application.

12 FIG. 12 FIG. 12 FIG. 1 2 10 10 Based on the foregoing embodiments, in a same scenario, a simulation comparison diagram of a remote suppression curve of a dielectric filter provided in embodiments of this application and a remote suppression curve of a conventional dielectric filter is shown in. In, a curveis the remote suppression curve of the dielectric filter provided in embodiments of this application, and a curveis the remote suppression curve of the conventional dielectric filter. A horizontal axis represents a frequency, and a unit is in gigahertz (GHz). A vertical axis represents a remote suppression degree of a dielectric filter, a unit is in decibels (dB). It can be learned fromthat coupling strength between high-order modes in a high-order harmonic wave section of the dielectric filterprovided in embodiments of this application is significantly reduced, thereby effectively improving the remote suppression degree of the dielectric filter, and helping reduce a design requirement of removing a low-pass filter to reduce insertion losses in a communication device system.

The foregoing descriptions are merely implementations of embodiments of this application and are not intended to limit the protection scope of embodiments of this application. Any variation or replacement within the technical scope disclosed in embodiments of this application shall fall within the protection scope of embodiments of this application. Therefore, the protection scope of embodiments of this application shall be subject to the protection scope of the claims.